Cleaning sponge



FIG. 1 is a perspective view of a cleaning sponge showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, the right side view being a mirror image thereof; and,

FIG. 5 is a top view thereof, the bottom view being a mirror image thereof. 

CLAIM The ornamental design for a cleaning sponge, as shown and described. 